Hello Saurav

Greetings

64 Percentile is Not good Percentile for a candidate belong to General category Because Your rank estimated based on current exam only will be very large around 300000 which You can understand that Even not able to qualify for JEE Advance, Therefore I would like to suggest you Appear for the JEE Main April exam and Perform well to get some Good college.

You can follow the below points to prepare for Your JEE Main April

1 Focus on NCERT and once You complete it then only go for Next Books.

2 Solve all the Previous Years Questions 

3 Appear for as many mock tests You can so as to analyse Your performance and get the real-time feel of the original test.

The registration for JEE Main April will begin from February 8th Onwards.

Hope this Helps All the best.